Cast-in-place pile construction method for underground engineering structure

Abstract

The invention provides a filling pile construction method for an underground construction structure. The method comprises the following steps that a, soil bodies on a top plate of the existing structure are excavated to expose the top plate of the existing structure; b, a first through hole is drilled in the top plate of the existing structure, and the effect that the hole diameter of the first through hole is no smaller than that of a steel casing is ensured; c, a blind hole is formed in a bottom plate of the existing structure, a second through hole and the first through hole are coaxial, the hole diameter of the second through hole is no smaller than that of the steel casing, and the effects that the second through hole does not get through, and concrete is reserved at the bottom of the hole are ensured; d, light well point precipitation is conducted on the edge of the second through hole; e, the steel casing is placed, the bottom end of the steel casting moves downwards to penetrate through the first through hole, and then gets through the second through hole, and is placed under the bottom plate of the existing structure; f, gaps on the outer wall of the steel casing are backfilled with cement paste; g, the soil bodies outside the part, above the existing structure, of the steel casing are backfilled with cement soil; and h, a filling pile is constructed in the steel casing, the steel casing is pulled out after the filling pile is completed, and plain concrete is used for sealing the holes. The problem that construction is difficult when filling piles encounter built underground structures is solved.

Description

technical field [0001] The invention belongs to the engineering fields of rail transit engineering, underground space development engineering, underground passage engineering, housing construction engineering, reconstruction and expansion, etc., and in particular relates to a construction method of cast-in-place piles for underground engineering structures. Background technique [0002] As a common structural form of foundation engineering and foundation pit enclosure, cast-in-situ piles often need to pass through existing underground structures in practical applications, such as abandoned civil air defense projects and municipal underground structures that are often encountered in the construction of foundation pit enclosure structures. The construction of structures, even the construction of engineering piles and underpinning piles in the downward reconstruction and expansion project of the existing basement, requires the construction of cast-in-place piles through the unde...

AI Technical Summary

Problems solved by technology

The construction method of cast-in-place piles not only affects the smooth progress of the project, but even affects the quality of piles. Improper construction methods can easily cause engineering accidents and risks.

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